Typewriting machine



Feb. 25, 1930. w. F. HELMOND 1,748,648

TYPEWRITING MACHINE Filed Nov. 28. 1927 men/0r:

byv W Af/a/ay v isprovided with two dowel-pins which fit in PatentedFeb. 25, 1 930 UNITED STATES.

PATENT OFFICE WILLIAM F. HELMOND, OF HARTFORD, CONNECTICUT, ASSIGNOR TOUNDERWOOD ELLIOTT FISHER COMPANY, OF NEW YORK, N. Y., A CORPORATION'OFDELAWARE "rvrnwm'rme MACHINE Application filed November 28, 1927. SerialNo, 236,124.

This invention relates to carbon-holding devices for typewritingmachinesof the kind or type for writing upon a continuous web comprisinga plurality of plies which may be in the form offan-folds, such, forexample, as the typewriting machine forming the subject of the patent toWernery & Smith, N 0. 1,132,055, of March 16, 1915, and moreparticularly the present invention is an improvement upon thecarbon-holding device disclosed in the patent to J esse'A. B. Smith, No.1,177,546, of March 28, 1916, .for typewriting machines.

The machine disclosed in the Smith pat ent includes a carbon-carryingblade which holes in the blade-bracket and a separatelymountedblade-manipulating finger-piece. In practice, these pins are mountedclose together, being spaced about it; of an inch apart, and it isnecessary that. they be very accurately positioned;the pins are so closetogether that it is extremely diificult to prevent side'play in theblade which must be held stationary and in parallel relation withrespect to the platen to insure the correct positioning of thecarbon-paper. It will also be noted that variations in spacing betweenthe blade-pins and holes in the blade-brackets require enlargement ofthe holes or reduction of the pin-diameter, thusmaking it difficult toprovide interchangeable blades, due to increasing the play in themounting of the blade; because of the extreme accuracy in spacingrequired between the blade-pins and corresponding bracket-holes,interchangeability is impossible'except at a great cost of production.

' The primary object ofthe .present invention is to improve and simplifythe construction and mounting of the carbon-carryingblade on thesupporting bracket, to facilitate the positioning and securing of theblade against play, and in parallelism with respect to the platen of thetypewriter and so that x the blades may be interchangeably positioned onthe bracket. The construction includes a wider bracket, providing for agreater spread between the blade-pins and brac ketholes; the spacebetween the pins and holes is increased to an inch instead of of an inchThe blade is provided with a single downwardly-extending pin which canbe fitted "with just enough clearance to enter a hole in the bracket,which preventssagging of the blade. Upon an upper extension of this pin,a blade-manipulating finger-piece is secured, and, between the blade andthis fingerpiece, a carbon-sheet-clamping mem her is pivotally mounted.The bracket is provided with an upstanding pin in spaced relation to thehole therein, and is engaged by the sides of a bifurcated end of theblademember formed by an inwardly-extending slot, so that the sidesthereof closely engage the pin, the slot extending sufficiently to takecare of any variation in the distances between the pins and holes ofdifferent brackets. This arrangement avoids the necessityfor the extremeaccuracy in interchangeably spacing the two pins and the two 1 holes.

An advantage of the construction is the ready interchangeability ofblades, since it is an easy matter to make the single pin and slot ofthe blades interchangeable withthe vantage of the construction residesin the reduction-of the number of parts on the blade by utilizing asingle blade-mounting pin, upon an upward extension of whichthecarbonc-sheet-clamping member is mounted, and

the blade-manipulating finger-piece thereon fold typewriting machinehaving the present improvements applied thereto.

7 Figure 2 is an elevation of a portion thereof, partly in verticalsection.

' Figure, 3 is-a perspective view of the im provements.

bracket-hole and locating pin. A further ad Referring to theaccompanying drawings, the rearward extension 11 of an Underwoodfan-fold typewriting machine is provided with rails 12 upon which areciprocating carhon-carriage 13 travels in the usual manner and isprovided with an operating handle 13,- as disclosed in the Wernery &Smith patent hereinbefore referred to. The typewriter-platen isgenerally indicated b the reference letter P, and the fan-fold we andinterleaving carbon-sheets by the letters W and C respectivel On theends of the reciprocatin carboncarriage are stepped brackets 14 an 15,upon which carbon-carrying blades 16 and 17 are mounted; the blades 16being mounted on the left-hand bracket- 14 and the blades 17 on theright-hand bracket 15 at the right-hand end of the carriage. The blades16 and 17 are arranged to extend towards each other and overlap in theusual manner, and, preferably in practice, blades 16 are positionedabove blades 17, the levels of the steps on brackets 15 not being quiteas high as those of brackets 14 for that purpose.

As best shown in Figure 3, the left-hand bracket 14: is provided with aportion 18 extending to the left thereof, so as to materially increasethe transverse dimension of each step 19, which step is provided with ahole 20 adjacent to its inner or. right-hand end, and a pin 21 on theextending left-hand portion thereof. The bracket 15 is similarlyconstructed, but the extending portion is to the right side instead .ofto the left side, as will be readily understood. The drilling ofthe-holes 20 and the drilling of the holes for thedriven-in pins 21 ineach bracket 14 and 15 may be done in the usual manner at one operationwith a gig for hole-spacings of approximate accuracy without recourse tofine gaging operations with their associated limits for tolerance.

Each carbon-blade 16 comprises a longitudinal member having adownwardly-extending pin 22 adjacent to its left-hand end, which isfitted for a running-fit to enter one of the holes 20 in the bracket 14,and the extreme end of the blade-member is provided with a bifurcatingslot 23, which closely engages the sides of a corresponding pin 21 onthe extending ortion of the bracket, the slot 23 being cut eep enough toprovide a slight end clearance space 2 1 to the right of the pin 21, asindicated in Figure 1, so that the blade may be readily andinterchangeably positioned on any of the steps 19 of difierent bracketswithout requiring extreme accuracy in the positioning of the pins 21with respect to the holes 20 of these brackets. Blades 17 which, passedthrough a hole in the blade 16 and through a hole of correspondingdiameter rpaaeae in the finger-piece 26, is terminally riveted in saidfinger piece where a hole 26 of lar er diameter is provided. An integralco ar 26" on the finger-piece forms a pivot on which the clip 25 isswingable for clamping a carbon C on said blade, while the finger-piecefacilitates manipulation of the blade when mounting the latter on thebracket-member. The pin 22 provides a mounting member for the blade andthe blade, with the assembled finger-piece and clip-member, becomes astock-unit, thereby materially reducing the number of loose parts forthe final assemblyoperations.

The clip 25 is capable of swinging rear wardly away from theblade-member to permita carbon-sheet C to be placed thereon with the endof the sheet doubled so as to extend on both sides of the blade-member.The blade-member is preferably provided with two or more spaced slots27, and the clip with correspondingly-spaced detents or tongues 28 forengaging in said slots when the clip is in sheet-holding position,whereby both the clip and carbon-sheet are securely held. The spacing ofthe clamping members formed by the slots and detents provides aplurality of holding means along one end of the carbon-sheet, whichpositively insures the holding thereof in a manner so that the carbonwill not be twisted sidewise with respect to the blade during themanipulation of the fan-fold web W and the carbon-stripping operations.

The free ends of the carbon-blades may be provided with usualweb-slitters 29 when desired, and the slitters of the right-hand blade17 may extend into clearance slots or notches 30 formed in the bracket14. The

slitters on blades 16 extend over the underlying right-hand blades 17mounted on the bracket 15 and are supported by-the latter. blades.

Variations may be resorted to within the scope of the invention, andportions of the improvements may be used without others.

Having thus described my invention, I claim:

1. In a carbon-sheet-holding device for a fan-fold typewriting machine,the combination of a carbon-carrier having a supporting bracket and aseries of sheet-holding blades removably attached thereto, said bracketand blades each provided with holding pins and each having openings forreceiving corresponding pins of the opposite-member, said pins andopenings relatively arranged to permit the blades to be readilypositioned on and removed from the bracket and to hold the bladesparallel when in' position on the bracket, and self-adapting meanswhereby variations in the distance between the pins and openings in thebracket may be compensated for by the pin and opening in ,the

blade, thereby affording interchangeability of blades with respect tothe bracket without having to fit them.

2. In' a carbon-sheet-holding device fora fan-fold typewriting machine,the combination of a carbon-carrier having a supportlng bracket and aseries of sheet-holding blades removably attached thereto, said bracketand blades each provided with holding pins and each having openings forrece'ivmg corresponding pins of the opposite'member, said pins andopenings relatively arranged to per,- mit the blades to be readilypositioned on and removed from the bracket and to hold the bladesparallel when in position on the bracket, self-adapting means wherebyvariations in the distance between the pins and openings in the bracketmay be compensated for by the pin and opening in the blade, therebyaifording interchangeability of blades with respect to the bracketwithout having to fit them, and holding clips pivotally mounted on thepins on the bladesfor clamping the carbon-sheets to the blades.

3. In a carbon-sheet-holding device for a fan-fold typewriting machine,the combination of a bracket having an upwardly-extending pin at oneside and a hole at its other side and a carbon-carrying blade having apin adjacent to one end for engaging said hole in the bracket, and abifurcating slot extending inwardly from its'end which closely engagesthe sides of the upwardly-extending pin on the bracket for holding theblade in position hon-sheet to the blade.

5. In a carbon-sheet-holding device for a fan-fold typewriting machine,the combination of a bracket having a hole adjacent one side thereof andan extending side member on the opposite side provided with anupwardly-extending pin adjacent its outer side edge whereby said pin isspaced at a distance from said hole, and a carbon-carrying blade havinga pin adjacent to one end thereof for engaging said hole in the bracketand having a bifurcating slot extending inwardly from its end at adistance from said pin correspond-.

ing with the distance between the pin and the hole of the bracket, whichslot closely engages the sides of the upwardly-extending pin on thebracket for holding the blade in position thereon.

6. In a carbon-sheet-holding device for a fan-fold typewriting machine,the combination of a stepped bracket, each step having anupwardly-extending pin at oneoside and a hole at its other side, and aset of carbon-carrying blades, each having'a pin for engaging a hole inthe bracket and a bifurcating slot extending inwardly from its end-forclosely engaging the sides of the corresponding upwardlyextending pin onthe bracket for holding the blade in' position thereon. c

7 i The combination of a sheet-holding blade formed with a plurality ofspaced slots or notches and a downwardly-projecting mounting pinadjacent one end thereof having an extension on the upper side of theblade, a

finger-piece secured on said upper extension of the pin, and a holdingclip pivotally mounted'thereon between the blade and the finger-piece topermit said clip to swing into and out of position to clamp the sheet tothe blade, said clip provided with a plurality of correspondingly spaceddetentsto enter said slots or notches to firmly clamp the sheet to theblade and prevent shifting or twisting of the sheet with respect theretoand also hold the clip in clamping position.

8. In a carbon-sheet holding device, the combination of a supportingbracket and a series of sheet-holding blades removably'attached thereto,said bracket having a series of upstanding pins at its outer side and acorresponding series of holes along its inner side, said blades eachformed with a plurality of slots or notches, a downwardly-projectingmounting pin adjacent one end of each blade for closely fitting intoahole in the bracket and each blade having a bifurcating slot extendinginwardly from the end thereof, which closely engages the sides of one ofthe upwardly-extending pins on the bracket for holding the blades inposition thereon, said pins having extensions on the upper sides of theblades, a finger-piece'secured on said upper extension of each pin, anda holding clip pivotally mounted on each pin between the blade and thefinger-piece to permit the clips to swing into and out of position toclamp the sheet to the blades, each of said clips provided with aplurality of correspondingly spaced detents to enter said slots ornotches 1n the blades to firmly clamp the sheets to the blades andprevent shifting or twisting of the sheets with-respect to the bladesand also hold a the clips in clampingv position on the blades. .9. In acarbon-sheet-holding device for a fan-fold typewriting machine, thecombination of a. carbon-carrier having 'a pair of brackets, one bracketat each side of a fan-fold web to support a series of carbon-sheet-carrying blades bet-ween the plies of the webs, and means for detachablysecuring one end of each blade to a'bracket for carbon-sheet renewal,

said means including a locating pin and a locatin'g hole on the bracketfor each blade spaced apart wlth approximate accuracy, and

a pin and a slot in the anchering end of each blade, said blade-pinentering a, locating hole in the bracket for laterally supporting theblade, and said s'lot engaging the sides of the locating pin on thebracket for a close alignment of the blade, the slot in the bladejustifying any variation in the spacing of the locating pin and thelocating hole in the bracket.

1 in F. HELMOND.

